Sick days are a terrible concept.

If I have a mild headache, can I take a sick day? What if it's November and I haven't used any sick days? What if I'm nauseous when I wake up, but I'm fine by lunch? Can I use sick days for psychological reasons? What if someone sees me in public and thinks I don't look sick? Should I follow these rules, or can I fake a phone cough as well as my co-workers?

Just give me an allotment for paid time off (and maybe unpaid time off), and let me run my life/work balance.